从服务中获取错误的输出

问题描述 投票:0回答:1

我正在研究逻辑,我必须在其中使用PersonDto列表,并根据PersonDto中存在的规则值(private String rule;)应用规则。

我有一个名为Rules的接口,它将有多个实现。但是对于这个问题,我仅添加了一个名为Rule1。]的实现。

我还有一个RuleMapper

类,该类负责按需提供bean。

问题:

基于PersonDto中存在的规则值,我正在应用规则。在Rule1类中,我具有修改id字段的逻辑。我正在设置新的id作为参数。最后,我将结果存储到ArrayList中。但是在ArrayList中,所有PersonDto的值都将作为我应用规则时传递的最后一个id值来。

例如:

 List<String> ids = Arrays.asList("10001", "100002");
    List<PersonDto> result = new ArrayList<PersonDto>();

    persons.stream().forEach(person -> {
        ids.stream().forEach(id -> {
            System.out.println(ruleMapper.getRule(person.getRule()).applyRule(person, id));

            result.add(ruleMapper.getRule(person.getRule()).applyRule(person, id));

        });
    });

您可以在上面的代码片段中看到,有两个id 10001

10002,但是当我存储然后打印结果时,我会得到带有id]的PersonDto所有元素中的>值都为10002。但是,当我在循环内执行System.out.println()时,我会看到正确的结果。

有关更多信息或重现该问题,请参考下面的完整代码:

PersonDto

package com.example.dto;

public class PersonDto {
protected int id;
protected String name;
private String rule;

public int getId() {
    return id;
}

public void setId(int id) {
    this.id = id;
}

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}



public String getRule() {
    return rule;
}

public void setRule(String rule) {
    this.rule = rule;
}

@Override
public String toString() {
    return "PersonDto [id=" + id + ", name=" + name + ", rule=" + rule + "]";
}

}

规则界面

package com.example.service;

import com.example.dto.PersonDto;

public interface Rules {

public PersonDto applyRule(PersonDto input, String newId);

}

规则1实现

package com.example.service;

import org.springframework.stereotype.Service;

import com.example.dto.PersonDto;

@Service
public class Rule1 implements Rules {

@Override
public PersonDto applyRule(PersonDto input, String newIdt) {
    input.setId(Integer.parseInt(newIdt));
    return input;
}

}

RuleMapper

package com.example.service;

import java.util.Map;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service

公共类RuleMapper {

@Autowired
private Map<String, Rules> beans;

public Rules getRule(String ruleName) {
    return beans.get(ruleName);
}

public Map<String, Rules> gelAllBeans() {
    return beans;
  }
}

Controller

package com.example.demo;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Random;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import com.example.dto.PersonDto;
import com.example.service.RuleMapper;

@RestController
public class StudentContoller {

@Autowired
private RuleMapper ruleMapper;

@GetMapping(value = "/test")
public void saveStudent() throws Exception {
    List<String> orders = Arrays.asList("order 1", "order 2");

    List<PersonDto> persons = new ArrayList<PersonDto>();

    for (int i = 0; i < 10; i++) {
        PersonDto per = new PersonDto();
        per.setId(i);
        per.setName("John Doe_ ".concat(String.valueOf(i)));
        per.setRule("rule" + getRandomRule());
        persons.add(per);
    }


    List<String> ids = Arrays.asList("10001", "100002");
    List<PersonDto> result = new ArrayList<PersonDto>();

    persons.stream().forEach(person -> {
        ids.stream().forEach(id -> {
            System.out.println(ruleMapper.getRule(person.getRule()).applyRule(person, id));

            result.add(ruleMapper.getRule(person.getRule()).applyRule(person, id));

        });
    });


    for (PersonDto person : result) {
        System.out.println(person);
    }

}

private int getRandomRule() {
    Random r = new Random();
    int low = 1;
    int high = 2;
    int result = r.nextInt(high - low) + low;

    return result;
 }

}

预期输出

PersonDto [id=10001, name=John Doe_ 0, rule=rule1]
PersonDto [id=100002, name=John Doe_ 0, rule=rule1]
PersonDto [id=10001, name=John Doe_ 1, rule=rule1]
PersonDto [id=100002, name=John Doe_ 1, rule=rule1]
PersonDto [id=10001, name=John Doe_ 2, rule=rule1]
PersonDto [id=100002, name=John Doe_ 2, rule=rule1]
PersonDto [id=10001, name=John Doe_ 3, rule=rule1]
PersonDto [id=100002, name=John Doe_ 3, rule=rule1]
PersonDto [id=10001, name=John Doe_ 4, rule=rule1]
PersonDto [id=100002, name=John Doe_ 4, rule=rule1]
PersonDto [id=10001, name=John Doe_ 5, rule=rule1]
PersonDto [id=100002, name=John Doe_ 5, rule=rule1]
PersonDto [id=10001, name=John Doe_ 6, rule=rule1]
PersonDto [id=100002, name=John Doe_ 6, rule=rule1]
PersonDto [id=10001, name=John Doe_ 7, rule=rule1]
PersonDto [id=100002, name=John Doe_ 7, rule=rule1]
PersonDto [id=10001, name=John Doe_ 8, rule=rule1]
PersonDto [id=100002, name=John Doe_ 8, rule=rule1]
PersonDto [id=10001, name=John Doe_ 9, rule=rule1]
PersonDto [id=100002, name=John Doe_ 9, rule=rule1]

实际输出

PersonDto [id=100002, name=John Doe_ 0, rule=rule1]
PersonDto [id=100002, name=John Doe_ 0, rule=rule1]
PersonDto [id=100002, name=John Doe_ 1, rule=rule1]
PersonDto [id=100002, name=John Doe_ 1, rule=rule1]
PersonDto [id=100002, name=John Doe_ 2, rule=rule1]
PersonDto [id=100002, name=John Doe_ 2, rule=rule1]
PersonDto [id=100002, name=John Doe_ 3, rule=rule1]
PersonDto [id=100002, name=John Doe_ 3, rule=rule1]
PersonDto [id=100002, name=John Doe_ 4, rule=rule1]
PersonDto [id=100002, name=John Doe_ 4, rule=rule1]
PersonDto [id=100002, name=John Doe_ 5, rule=rule1]
PersonDto [id=100002, name=John Doe_ 5, rule=rule1]
PersonDto [id=100002, name=John Doe_ 6, rule=rule1]
PersonDto [id=100002, name=John Doe_ 6, rule=rule1]
PersonDto [id=100002, name=John Doe_ 7, rule=rule1]
PersonDto [id=100002, name=John Doe_ 7, rule=rule1]
PersonDto [id=100002, name=John Doe_ 8, rule=rule1]
PersonDto [id=100002, name=John Doe_ 8, rule=rule1]
PersonDto [id=100002, name=John Doe_ 9, rule=rule1]
PersonDto [id=100002, name=John Doe_ 9, rule=rule1]

我正在研究逻辑,在该逻辑中,我必须使用PersonDto列表,并根据PersonDto中存在的规则值(私有字符串规则;)应用规则。我有一个称为“规则”的接口,该接口...

java spring spring-boot java-8
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投票
persons.stream().forEach(person -> {
    ids.stream().forEach(id -> {
        result.add(ruleMapper.getRule(person.getRule()).applyRule(person, id));
    });
});

此循环遍历所有人。对于每个人,它遍历所有ID。对于每个ID,您都将规则应用于此人。但是由于规则包含修改人员的ID,因此最后一个ID是人员中存储的ID。

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